package com.guopiao.vat.common.util;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.io.IOException;
import java.security.SecureRandom;

public class DESUtil {

    private final static String DES = "DES";



    public static void main(String[] args) throws Exception {
        //http://localhost:8099/issueInvoice?storeNo=B108&ticketNo=22240&ticketTime=20170920182059&ticketAmount=150
        //1Vp9M49vIrE=    dERZF56TAus=  KXkJGUbHUIxHq1abzLScvA==  ETfd/MEsOUc=
        //http://192.168.2.207:8099/issueInvoice?storeNo=1Vp9M49vIrE=&ticketNo=ApOCHb7QgTE=&ticketTime=KXkJGUbHUIxHq1abzLScvA==&ticketAmount=ETfd/MEsOUc=
        //http://192.168.6.146:8099/issueInvoice?storeNo=QZXws4mFC0o=&ticketNo=4miKmaghYG4=&ticketTime=I5ruDts+Y49g/q6CphX2mw==&ticketAmount=ZqJKGXyT0ls=
//        String data = "20171010134001";
        String data = "B108";
        // System.err.println(encrypt(data, key));
        // System.err.println(decrypt(encrypt(data, key), key));
//        System.out.println(encrypt(data));
//        System.out.println(decrypt(encrypt(data)));
//        System.out.println(encrypt(data,"keytotal"));
        System.out.println(encrypt(data,"%x#b5_@!"));
//        System.out.println(decrypt(encrypt(data,"keytotal"),"keytotal"));

//        BASE64Decoder decoder = new BASE64Decoder();
//        byte[] b = decoder.decodeBuffer(str);

//        System.out.println(new String(b,"UTF-8"));


        //因为有"+"存在， 所以在包一层
        String out = java.net.URLEncoder.encode("QZXws4mFC0o=", "UTF-8");

        System.out.println(out);

        String out2 = java.net.URLEncoder.encode("4miKmaghYG4=", "UTF-8");

        System.out.println(out2);

        String out3 = java.net.URLEncoder.encode("I5ruDts+Y49g/q6CphX2mw==", "UTF-8");

        System.out.println(out3);

        String out4 = java.net.URLEncoder.encode("ZqJKGXyT0ls=", "UTF-8");

        System.out.println(out4);
        //http://localhost:8099/issueInvoice?storeNo=QZXws4mFC0o%3D&ticketNo=4miKmaghYG4%3D&ticketTime=I5ruDts%2BY49g%2Fq6CphX2mw%3D%3D&ticketAmount=ZqJKGXyT0ls%3D
        //http://bwvatax2xibei.chinacloudsites.cn/issueInvoice?storeNo=QZXws4mFC0o%3D&ticketNo=4miKmaghYG4%3D&ticketTime=I5ruDts%2BY49g%2Fq6CphX2mw%3D%3D&ticketAmount=ZqJKGXyT0ls%3D
    }



    /**
     * Description 根据键值进行加密
     *
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws Exception
     */
    public static String encrypt(String data, String key) throws Exception {
        byte[] bt = encrypt(data.getBytes("UTF-8"), key.getBytes("UTF-8"));
        String strs = new BASE64Encoder().encode(bt);
        return strs;
    }

    /**
     * Description 根据键值进行解密
     *
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws IOException
     * @throws Exception
     */
    public static String decrypt(String data, String key) throws Exception {
        if (data == null)
            return null;
        BASE64Decoder decoder = new BASE64Decoder();
        byte[] buf = decoder.decodeBuffer(data);
        byte[] bt = decrypt(buf, key.getBytes("UTF-8"));
        return new String(bt, "UTF-8");
    }

    /**
     * Description 根据键值进行加密
     *
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

    /**
     * Description 根据键值进行解密
     *
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }
}
